@article{10_4064_fm_87_2_161_167,
     author = {Carl Jockusch},
     title = {Recursiveness of initial segments of {Kleene's} {O}},
     journal = {Fundamenta Mathematicae},
     pages = {161--167},
     publisher = {mathdoc},
     volume = {87},
     number = {2},
     year = {1975},
     doi = {10.4064/fm-87-2-161-167},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-87-2-161-167/}
}